. >> since california has the largest agricultural economy in the u.s. and about 14,000 beef cattle operations, the lack of livestock veterinarians is alarming. now meet 24-year-old zuhal elhan and ashley amaral, who are bucking the trend. they're students at u.c. davis school of veterinary medicine, interning with dr. nancy martin, who is an experienced vet and is giving them hands-on training working with bulls on a yolo county family ranch. >> it's really amazing, because you can only learn so much in a classroo. the classroom gives us a great basis, and then coming out during the summer, it just gives us the clinical experience that helps tie all the ideas we get from the classroom together. >> today they're learning to test the bulls for disease. it sounds simple, but it's not, especially as some of these bulls can weigh 1,300 pounds. >> yeah. no, the first time that i had to measure the... you know, something under the bull, and every time he moved, i jerked back, pulled away, because i don't want to get kicked. but i think that having that awarene